Make a distinction between 'outer' and 'inner' paths when binning.
Make a distinction between 'outer' and 'inner' paths when binning.

Since libArachne treats _all_ outer walls, including holes, as index 0, then the next as index 2, etc. But if we want to print outside-in or inside-out, this represents a problem.

CURA-7557 CURA-7677

Ultimaker/CuraEngine,Ultimaker/CuraEngine